Apparatus for stopping spindle assemblies of a textile yarn processing machine in a predetermined position

ABSTRACT

Apparatus for automatically stopping rotation of a spindle assembly of a textile yarn processing machine in a predetermined position and responsive to a predetermined condition of yarn breakage and/or the formation of a full package of processed yarn. The textile yarn processing machine includes rotatable spindle assemblies each having a whorl portion for rotating thereof and a brake for stopping rotation thereof, a drive belt for driving the whorl portions and pivoting tension rolls for holding the drive belt in tight engagement with the whorl portions for normal rotation thereof in a first position and movable to a second position for holding the drive belt in loose engagement with the whorl portion for allowing stopping of the spindle assembly and for slight rotation of the spindle assembly. The apparatus for stopping the spindle assemblies in a predetermined position includes yarn feelers actuated by the predetermined yarn condition, devices for actuating the spindle assembly brake to stop rotation of the spindle assembly upon actuation of the yarn feelers, control devices for the tension rolls for causing movement of the tension rolls to the second position upon actuation of the yarn feelers for allowing stopping of the spindle assembly, time delayed devices responsive to actuation of the yarn feelers for deactuating the brake after a predetermined time delay for allowing the slight rotation of the spindle assemblies by the loose engagement of the drive belt, and spindle assembly stop devices for stopping rotation of the spindle assembly in the predetermined position after the time delay of the time delayed devices and during the slight rotation of the spindle assembly following deactuation of the spindle brake.

United States Patent Steppuhn [451 Apr. 23, 1974 APPARATUS FOR STOPPINGSPINDLE ASSEMBLIES OF A TEXTILE YARN PROCESSING MACHINE IN APREDETERMINED POSITION [75] lnventor: Bru'no Steppuhn, Krefeld, Germany[73] Assignee: Palitex Project Company GmbH,

Krefeld, Germany [22] Filed: June 21, 1972 [21] Appl. No.: 264,816

[30] Foreign Application Priority Data 7 June 22, l97l Germany 2130762[52] US. Cl. 57/81, 57/34 R, 57/88 [5]] Int. Cl.... D0lh 13/16, DOlh13/24, DOlh 7/22 [58] Field of Search 57/78-89, 104, 105, 34R

7 [56] References Cited UNITED STATES PATENTS 3,141,287 7/1964 F61Tr5iii.LJ'..IIY.TIIT57IW 3,169,361 2/1965 White 57/79 3,364,670 1/1968 Stiepelet al. 57/88 3,410,073 11/1968 Brisken et al.... 57/88 X 3,645,0842/1972 Nimtz 57/88 3,466,865 9/l969 Franzen et al... 57/88 3,517,4976/1970 Rettenmund 57/8l Primary Examiner-John Petrakes [57] ABSTRACTspindle assembly of a textile yarn processing machine in a predeterminedposition and responsive to a predetermined condition of yarn breakageand/or the formation of a full package of processed yarn. The textileyarn processing machine includes rotatable spindle assemblies eachhaving a whorl portion for rotating thereof and a brake for stoppingrotation thereof, a drive belt for driving the whorl portions andpivoting tension rolls for holding the drive belt in tight engagementwith the whorl portions for normal rotation thereof in a first positionand movable to a second position for holding the drive belt in looseengagement with the whorl portion for allowing stopping of the spindleassembly and for slight rotation of the spindle assembly. The apparatusfor stopping the spindle assemblies in' a predetermined positionincludes yarn feelers actuated by the predetermined yarn condition,

the yarn feelers for deactuating the brake after a predetermined timedelay for allowing the slight rotation of the spindle assemblies by theloose engagement of the drive belt, and spindle assembly stop devicesfor stopping rotation of the spindle assembly in the predeterminedposition after the time delay of the time delayed devices and during theslight rotation of the spindle assembly following deactuation of thespindle brake.

18 Claims, 8 Drawing Figures PATENTEI] APR 2 3 I974 SHEET 4 OF 7PATENTED APR 23 \974 SHEET 5 BF 7 Q N O w in PATENTEDAFR231974 3.805507' SHEET 7 BF 7 W51:- if I %45 88 lZ0,- ine 1&0 O

Y RN Feeuze PSWWCH ACTlVATED SPINDLE- BRAKE- CAM BELTTENSKJN 127k ROLL.CAM

Mow-o2 CAM 5mm. LlGHT CAM SPlNDLE:

Assamaw OTATMG" C VA ED ACTWATED SKGNAL LAG-HT Rasmewme SW \TCH 1APPARATUS FOR STOPPING SPINDLE ASSEMBLIES OF A TEXTILE YARN PROCESSINGMACHINE IN A PREDETERMINED POSITION This invention relates to theimprovement of automatic means responsive to a predetermined conditionof yarn breakage and the formation of a full package of processed yarnfor stopping rotation of a spindle assembly of a textile yarn processingmachine, such as a twister, spinning frame or the like, in apredetermined position.

In textile yarn processing machines, particularly 2- for-l twisters, itis desirable to stop rotation of the spindle assembly in a givenposition, i.e., the position in which the yarn emerges from the rotatingportions of the spindle assembly for facing the outside for access by anoperator, upon the occurrence of yarn breakage during yarn processing orthe formation of a full package of processed yarn.

Heretofore, no satisfactory automatic devices have been proposed forstopping rotation of the spindle assemblies of such a yarn processingmachine in a predetermined position upon the occurrence of yarn breakageor the formation of a full package of processed yarn for purposes ofservicing the spindle assembly by an operator.

Accordingly, it is the object of this invention to provide apparatus andmeans for automatically stopping a spindle assembly of a yarn processingmachine in a predetermined position upon the occurrence of either yarnbreakage and/or the formation of a full package of processed yarn.

'It has been found by this invention'that the above object may beaccomplished by providing such means in a textile yarn processingmachine, such as a twister, spinning frame or the like, having aplurality of rotatable spindle assemblies for processing of yarn andforming a package of processed yarn. Wherein each spindle assemblyincludes a whorl portion for effecting rotation thereof and a brakemeans for stopping rota tion thereof, a tangential drive belt meansengaging the whorl portions of the spindle assemblies for causingrotation thereof, and pivotally mounted tension roll means associatedwith each of the spindle assemblies for holding the drive belt in tightdriving engagement with the whorl portion for normal rotation of thespindle assembly in a first position thereof and movable to a secondposition for holding the drive belt in loose engagement with the whorlportion of the spindle assembly for allowing stopping of the spindleassembly and for slight rotation of the spindle assembly.

The automatic means for stopping rotation of the spindle assembly in apredetermined position upon yarn breakage and/or the formation of a fullpackage of processed yarn includes yarn feeler means actuated by thepredetermined yarn condition, means operatively connected between theyarn feeler means and the spindle assembly brake means for'actuating thebrake means to stop rotation of the spindle assembly upon actuation ofthe yarn feeler means, tension roll control means operatively connectedwith the yarn feeler means for causing movement of the tension rollmeans to the second position upon actuation of the yarnfeeler means forallowing stopping of the spindle assembly, time delayed meansoperatively connected with the yarn feeler means and the brake actuatingmeans and responsive to actuation of the yarn feeler means fordeactivating the brake eans after a predetermined time delay forallowing the slight rotation of the spindle assembly by the looseengagement of the drive belt, and spindle assembly stop meansoperatively associated with the spindle assembly and the time delayedmeans for stopping rotation of the spindle assembly in the predeterminedposition after the predetermined time delay of the time delayed meansand during the slight rotation of the spindle assembly followingdeactuation of the spindle assembly brake means.

Preferably, the spindle assembly stop means also include suitable meansfor allowing tension to build up in the yarn upon restarting of thespindle assembly before activating of the yarn feeler devices and thespindle as sembly brake means so as to prevent actuation of the yarnfeeler devices during start up. Preferably, these spindle assembly stopmechanisms include a combination of electrical and mechanical devices.

In a preferred embodiment of this invention, the automatic means forstopping rotation of the spindle assembly in a predetermined positionincludes yarn feeler means comprising a first electrical switch engagingthe yarn as it passes from the spindle assembly to the package roll foractuation when yarn breakage occurs and a second electrical switchcontacting the surface of the package of yarn on the package roll foractuation upon the formation of a full package of processed yarn. Theautomatic means further includes electrical circuit means operativelyconnected between the yarn feeler switches and the spindle assemblybrake means for actuating the brake means to stop rotation of thespindle assembly upon actuation of either of the yarn feeler switches.This preferred embodiment includes a tension roll control meanscomprising a lever mounted for pivotal movement medially thereof andcarrying the tension roll means on one end thereof for movement betweenthe first and second positions, means biasing the lever means and thetension roll means in the second position of the tension roll means,movable stop means operatively associated with the otherend of the levermeans and solenoid operated latch means operatively associated with thestop means and the electrical circuit means for holding the stop meansagainst the other end of the lever means to hold the lever means and thetension roll means in the first position of the tension roll means andresponsive to actuation of the electrical circuit means by either of theyarn feeler switches to move out of latching engagement with the stopmeans for allowing the levermeans, the tension roll means and the stopmeans to move under the influence of the biasing means to the secondposition of the tension roll means.

This preferred embodiment of automatic means for stopping rotation ofthe spindle assembly in a predetermined position further includes timedelayed means comprising a fluid controlled, compressible and expandablebellows means operatively connected with the tension roll lever meansfor .compressing during movement of the lever means and the tension rollmeans from the first position to the second position for delaying thetime of movement a predetermined amount, and a switch means disposed inthe electrical circuit means and operatively connected to the bellowsmeans for deactuation to deactuate the electrical circuit after the timedelayed movement of the tension roll means to the second position fordeactuating the brake means after a predetermined time delay forallowing the slight rotation of the spindle assembly by the looseengagement of the drive belt. This preferred embodiment further includesspindle assembly stop means comprising a projection secured to andextending from the tension roll control lever means for movement withthe lever means into close proximity with the whorl portion of thespindle assembly when the tension roll means moves to the secondposition, and a projection secured to and extending from the whorlportion of the spindle assembly for contact with the projection on thelever means when the lever means and the tension roll means have movedto the second position of the tension roll means after the time delay iseffected by the time delayed means to stop rotation of the spindleassembly in a predetermined position. The embodiment further includesmeans operatively associated with the time delayed means and the yarnpackage drive roll for stopping operation of the drive roll uponactuation of either of the yarn feeler switch means and after thepredetermined time delay.

A second preferred embodiment of automatic means for stopping rotationof the spindle assembly in a predetermined position includes yarn feelermeans comprising a first electrical switch engaging the yarn as itpasses from the spindle assembly to the package roll for actuation whenbreakage occurs and a second electrical switch contacting the surface ofthe package of yarn on the package roll for actuation upon the formationof a full package of processed yarn. This automatic means furtherincludes means operatively connected between the yarn feeler switchesand the spindle assembly brake means for actuating the brake means tostop rotation of the spindle assembly upon actuation of either of theyarn feeler switches. The spindle assembly brake actuating meanscomprises an electrical circuit connected with the yarn feeler switchesfor actuation when either of the switches is actuated, a motor connectedwith the electrical circuit for actuation when the electrical circuit isactuated, a first circular rotating cam driven by the motor and havingan outer and inner camming surface on its circumference, a cam followerfor successively engaging the camming surfaces and a brake actuatinglever means connected to the cam follower for actuating the spindleassembly brake means when the cam follower is in engagement with theinner camming surface and for deactuating the brake means when the camfollower is in engagement with the outer camming surface.

This second preferred embodiment further includes tension roll controlmeans comprising a second circular rotating cam driven by the motor andhaving an outer, a central and an inner camming surface on itscircumference, a lever mounted for pivotal movement medially thereof andcarrying the tension roll means on one end thereof for movement betweenthe first and second positions, means biasing the lever means and thetension roll means in the second position of the tension roll means, acam follower disposed on the other end of the lever means forsuccessively engaging the camming surfaces on the second cam and forholding the lever means and the tension roll means in the first positionof the tension roll means during engagement with the outer cammingsurface and for allowing movement of the lever means and the tensionroll means to the second position of the tension roll means under theinfluence of the biasing means during engagement with the centralcamming surface for allowing stopping of the spindle assembly.

Time delayed means are provided in this second preferred embodimentwhich are operatively connected with the yarn feeler switches and thebrake actuating means and are responsive to actuation of either of theyarn feeler switches for deactuating the brake means after apredetermined time delay for allowing the slight rotation of the spindleassembly by the loose engagement of the drive belt. The time delayedmeans comprises the first cam and the inner and outer camming surfacesbeing mounted for rotation relative to the second cam and the cammingsurfaces thereon so that the outer camming surface of the first camcomes into engagement with the cam follower of the brake actuating leverfor deactuating the spindle assembly brake means while the cam followeron the tension roll control lever is in engagement with the centralcamming surface on the second cam for holding the tension roll means inthe second position for allowing slight rotation of the spindle assemblyby the loose engagement of the drive belt.

This second preferred embodiment further includes spindle assembly stopmeans comprising a spindle assembly stop lever connected with thetension roll control lever for movement therewith and having aprojection secured to and extending from the spindle stop lever, aprojection secured to and extending from the whorl portion of thespindle assembly for contact with the projection on the stop lever forstopping the spindle assembly in the predetermined position when the camfollower on the tension roll control lever moves into engagement withthe inner camming surface on the second cam means and after thepredetermined time delay of the time delayed means and during the slightrotation of the spindle assembly following deactuation of the spindlebrake means. This embodiment also includes a third circular rotating camdriven by the motor and having an outer and inner camming surface on theperiphery thereof and an electrical switch means positioned forengagement by the camming surfaces of the third cam and actuated whenone of the camming surfaces comes into engagement with the switch means.This switch means is operatively connected with the drive roll for theyarn package for stopping operation of the drive roll upon actuation ofthe switch means. A fourth circular rotating cam driven by the motormeans and having outer and inner camming surfaces on its circumferenceis provided. An electrical switch is in contact with the fourth cam foractuation thereby when one of the inner or outer camming surfaces comesinto engagement with the switch. This switch is connected to the motorfor stopping operation of the motor and rotation of all of the cams whenthe spindle assembly has been stopped in the predetermined position.

Some of the objects and advantages of this invention having been stated,other objects and advantages will appear as the description proceedswhen taken in conjunction with the accompanying drawings, in which:

ing normal yarn processing and prior to the occurrence of yarn breakageor the formation of a full package of processed yarn;

FIG. 3 is a view, like FIG. 1, showing the spindle assembly stoppingmeans in the condition occurring upon the breakage of yarn or theformation of a full package of processed yarn and with the spindleassembly stopped in a predetermined position;

FIG. 4 is a view, like FIGS. 2 and 3, illustrating the spindle assemblystopping means in the condition occurring immediately after restartingof rotation of the spindle assembly and during the build up ofsufficient tension in the yarn to prevent actuation of the spindleassembly brake by the yarn feeler means due to insufficient tension inthe yarn;

FIG. 5 is a perspective view of generally the mechanical components ofthe first embodiment of the spindle assembly stopping means illustratedin FIGS. 2-4;

FIG. 6 is a diagrammatic, schematic, wiring diagram of a secondembodiment of a spindle assembly stopping means in accordance with thisinvention and shown in the condition of operation of the spindleassembly during normal yarn processing and prior to the occurrence ofyarn breakage of the formation of a full package 0 processed yarn;

FIG. 7 is a sectional plan view through a portion of the secondembodiment of FIG.'6; and

FIG. 8 is a plotted time-distance study for the second embodiment of thespindle assembly stopping means illustrated in FIGS. 6 and 7.

Referring now to the drawings, there is illustrated in FIG. 1 aschematic, perspective view of a single spindle assembly station of atextile yarn 2-for-l twister machine. lt is to be understood, that aplurality of these spindle assembly stations are provided in which thespindle assembly stations are arranged side-by-side in two'rows alongthe outsides of the machine. For purposes of this application, only onespindle assembly station will be described.

The spindle assembly station broadly includes a spindle assembly,generally indicated at 10, comprising a rotatably driven rotormechanism, generally indicated at 11, which includes a whorl portion 12suitably rotatably mounted on a portion of the twister machine frame 13and'rotated by a continuous, tangential, drive belt 14 in a manner wellunderstood by those with ordinary skill in the art. Tension rolls 15 areassociated with each spindle assembly and are pivotally mounted forengaging and holding the drive belt 14 in tight driving engagement withthe whorl portion 12 for normal rotation of the rotor mechanism 11 ofthe spindle assembly 10 in a first position of the tension roll 15. Thetension rolls are movable to a second position for holding the drivebelt 14 in loose engagement with the whorl portion 12 for allowingstopping of the rotor mechanism 11 of the spindle assembly 10 and forallowing slight rotation of the rotor mechanism 1 1 of the spindleassembly 10.

The spindle assembly 10 further includes a carrier mechanism 18 forcarrying a package 16 of yarn Y and being rotatably mounted on the rotormechanism 11 so that the rotor mechanism may rotate relative theretowhile the carrier mechanism is maintained in stationary position. Thecarrier mechanism includes a basket herein inasmuch as these completedetails are not necessary for an understanding of the present invention.

During yarn processing or twisting, yarn Y is withdrawn from the package16 and is threaded through the various mechanisms for twisting orprocessing of the yarn. The yarn Y emerges from the rotor mechanism 11at the end of channel 20 and forms a balloon of yarn Y around thepackage 16 and around the basket device 19. For purposes of restrainingthe size of the thus formed balloon of yarn Y, a hollow balloonrestrainer mechanism 22 is mounted around the above described mechanismsof the spindle assembly 10 and around the rotating balloon of yarn Y.The yarn Y is then led from the spindle assembly 10 through a pigtailguide 24, around a pre-take-up roller 25 and to a traversing device 26from which it is wound onto a package roll 27 carrying a suitable bobbinor carrier for receiving the traversely wound yarn Y after it has beentwisted or processed and for forming a package 28 of the twisted orprocessed yarn Y. The package roll 27 is driven or rotated by a driveroll 29 frictionally contacting the surface of the package 28 of yarnYou the package roll 27 for rotatably driving same. The drive roll 29 isdriven by shaft 30 to which it is magnetically or otherwise coupled.

Conventionally, the rotor mechanism 11 of the spindle assembly 10includes a suitable brake device for stopping rotation of the rotormechanism 11 of the spindle assembly 10 when formation of a full packageof processed yarn 28 is formed or upon the occurrence of a break in theyarn Y. Heretofore, these brake mechanisms have normally been manuallyoperated and details of such prior manually operated brake mechanism maybe seen in assignees prior U.S. Pat. No.-

3,466,865, issued Sept. 16, 1969. Details of the spindle assembly brakemechanism utilized in accordance with the present invention will bedescribed hereinafter.

In accordance with the present invention, means generally indicated at32 are provided for automatically stopping rotation of the spindleassembly 10 in a predetermined position in which the rotor mechanism 1 1and the yarn Y emerging from the channel 20 faces the outside of themachine for servicing by an operator upon the occurrence of yarnbreakage or the formation of a full package of processed yarn. Thisspindle assembly stopping means 32 is generally disposed below thespindle assembly 10, as shown in FIG. 1. For actuating the stoppingmeans 32, there are provided yarn feeler means in the form of a firstelectrical switch 35 engaging the moving yarn Y in any suitable positionas it passes from the spindle assembly 10 to the package roll 27 andconstructed for closing or actuation upon the breakage of the yarn Y.The yarn feeler means further include a second electrical switch 36contacting the surface of the package 28 of processed yarn Y on thepackage roll 27 and constructed for closing or actuation upon theformation of a full package 28 of processed yarn Y.

In FIGS. 2-5 of the drawing, a first preferred embodiment of theautomatic spindle assembly stopping means is illustrated. In this firstembodiment, an electrical circuit in the form of lines 37, 38, 39, 40,41 lead from the respective switches 35 and 36 and close an electricalcircuit from bus bars 42 and 43 through an electrically operated brakemechanism 44 for the rotor mechanism 11 of the spindle assembly 10. Thebrake device 44 may be any suitable electrically actuated brake. The

lines 39 and 40 of the above described electrical circuit are bridged bya switch 45. Accordingly, upon the occurrence of either yarn breakage,which closes the switch 35 (see FIG. 3), or the formation ofa fullpackage 28 of processed yarn Y, which closes the switch 36, a circuitwill be completed to the spindle assembly brake mechanism 44 forstopping rotation of the rotor mechanism 11 of the spindle assembly 10.However, the thus far described mechanisms do not insure stopping of thespindle assembly in a predetermined position and the position ofstoppage would be dependent upon the particular time one of the switches35 or 36 was closed.

For controlling the tension roll for movement between the abovedescribed first and second positions, the tension roll 15 is pivotallymounted at 50 on one end of a swing lever 51 which is swingable about afixed fulcrum 52. A linearly movable stop shaft 54 bears at one endagainst the other end of the lever 51 and in normal operating position(FIG. 2), holds the other end of the lever 51 against a fixed stop 55for holding of the lever 51 and the tension roll 15 in the firstposition of the tension roll 15 which holds the drive belt 14 in tightengagement with the whorl 12 of the rotor mechanism 11. The stop shaft54 is held in this position by a pivoted latch device 57 which engagesteeth 58 on the stop shaft 54. The latch mechanism 57 is pivotallymounted for moving out of engagement with the teeth 58 upon actuation ofa solenoid 60. The solenoid 60 is connected with the above describedelectrical circuit by lines 61 leading from line 40 and line 62 leadingfrom line 41 for actuation when the electrical circuit is actuated byclosing of either of the yarn feeler switches 35 or 36.

Thus, when the electrical circuit is actuated by one of the yarn feelerswitches 35 or 36, the solenoid 60 is actuated to move the latch 57 outof engagement with the teeth 58 on the stop rod 54. The tension rollcontrol lever 51 is biased by a spring 63 so that when the latch 57 isdisengaged from the teeth 58, the tension roll control lever 51 and thetension roll 15 will move under the bias of the spring 63 to the secondposition of the tension roll 15 (as shown in FIG. 3) which holds thedrive belt 14 in light contact with the whorl portion 12 of the rotormechanism 11. This movement of the tension roll control lever 51 willalso cause the other end thereof to move against the stop shaft 54pushing the stop shaft 54 downwardly (as viewed in FIG. 3) and outwardlyfrom the front of the yarn processing machine (as shown in FIG. 1).

The spindle assembly stopping means further includes a time delayedmeans comprising a fluid controlled, compressible and expandable bellowsmechanism 70 fixed at one end 71 and attached at the other end to alagging lever 72. The lagging lever 72 is fulcrummed at the tension rollcontrol lever fulcrum 52 for movement with the tension roll controllever 51 as the tension roll control lever 51 and the tension roll 15move from the first position to the second position of the tension roll15 (from the position shown in FIG. 2 to the position shown in FIG. 3).During this movement of the levers 51 and 72 and the tension roll 15,the bellows device 70 slowly contracts by pushing air or other fluid outof an outlet line 74 which includes a monitoring valve 75 therein toprovide a predetermined time delay in the movement of the levers 51 and72.

The bellows mechanism includes a lever 103 attached to the lever 51which suitably contacts a control handle of the valve mechanism forventing of the bellows mechanism 70 after the predetermined time delayedmovement.

A switching lever 77 is connected with the lever 72 at one end thereofand includes a bifurcated portion at the other end thereof carrying pins78 and 79 which are engaged in slots 80 and 81 of camming devices 82 and83, respectively. The camming device 82 is in engagement with a camfollower 84 attached to one end of the switch 45 so that as the lever 77moves with the lever 72, the pin 78 will ride in the slot 80 until itbottoms in the slot 80 and then moves the camming device 82 such thatthe cam follower 84 moves onto a portion of the surface of the cammingdevice 82 allowing the switch 45 to break the circuit leading to thespindle assembly brake mechanism 44 by breaking the circuit betweenlines 39 and 40 (as shown in FIG. 3). This immediately deactuates thebrake mechanism 44 after the predetermined time delay caused by thecontracting bellows mechanism 70 and after stopping of the rotormechanism 11 of the spindle assembly 10 by the brake mechanism 44. Thetension roll 15 has now moved to its second position which holds thedrive belt 14 in loose engagement with the rotor mechanism 11 of thespindle assembly 10 and thus allows slight rotation of the spindleassembly 10 by the loose contact of the drive belt and due to thedeactuation of the brake mechanism 44.

Attached to the tension roll control lever 15 is a spring biasedprojection 85 which extends outwardly therefrom and is pivotally mountedthereon for movement between the stop pins 86 and 87. As the lever 51moves the tension roll 15 from its firstposition to its second position(from the position of FIG. 2 to the position of FIG. 3), the projection85 comes into close proximity with the whorl portion 12 of the rotormechanism 11 of the spindle assembly 10. A cooperating stop projection88 is secured to the whorl portion 12 of the spindle assembly 10 and asthe whorl portion 12 is slightly rotated under the influence of theloose contact of the drive belt 14, the projection 88 comes in contactwith the projection 85 and the rotor mechanism 11 of the spindleassembly 10 is stopped in the predetermined position in which thechannel 20 from which the yarn Y emerges from the rotor mechanism 1 1faces the outside of the machine for servicing by an operator.

During the above described movement of the lever 77, the pin 79 as alsobottomed in the slot 81 of camming device 83 and the camming device 83is engaged by a follower 94 from a switch 95 which is disposed in acircuit comprising line 96 leading from line 41, line 97 which leads tothe magnetic or other coupling of drive roll 29 and line 98 which leadsfrom the coupling of drive roll 29 to the bus bar 42. Thus, when theswitch 95 is briefly closed by cam mechanism 83 during downward movementof the lever 77, the coupling device for drive roll 29 will bedeactuated stopping rotation thereof and stopping the drive of packageroll 27.

A line 100 leads from the switch 45 and to a line 101 connected withlighted signal devices 102 and connected with bus bar 43 such that whenthe switch 45 is moved by the camming device 82 to the position (FIG. 3)for breaking the circuit to the brake device 44, it will close thecircuit to the signal lights 102 lighting these lights up for indicationto an operator that servicing of the spindle assembly is needed.

The spindle assembly 10 has now been stopped in a predetermined positionand an operator may service a broken yarn Y or doff a full package 28 ofprocessed yarn Y.

For purposes of restarting the spindle assembly 10 after it has beenstopped in a predetermined position and has been serviced by anoperator, the stop shaft 54 may be manually pushed inwardly to move theother end of the tension roll control lever 51 against the stop 55 (asshown in FIG. 4) which moves the tension roll back to the first positionthereof for holding the drive belt 15 in tight engagement with the whorl12 of the rotor mechanism 11 of the spindle assembly 10 for normalrotation thereof. In order to insure that sufficient tension has beenbuilt up in the yarn Y upon restarting to prevent actuation of the yarnfeeler switch 35 and thus the brake 44 of the spindle assembly 10, thelever 72 lags behind the lever 51 due to the time delayed bellowsmechanism 70 (as shown in FIG. 4) for a predetermined time delay, thusholding the switch 45 in the position in which the circuit to the brakemechanism 44 from the yarn feeler switch 35 is open. The lagging lever72 is moved in its time delayed path of travel by a spring 105. As thebellows mechanism 70 expands and the lever 72 moves back into positionwith the lever 51 after a predetermined time delay, the camming device82 moves the switch 45 back into position for closing the circuitbetween ,line 39 and line 40. However, a sufficient tension has beenbuilt up in the yarn Y during this predetermined time delay forpreventing premature actuation of the yarn feeler switch 35.

Also, the camming device 83 has again momentarily closed the circuit tothe magnetic or other coupling of drive roll 29 thus actuating the driveroll 29,for rotation to drive the package roll 27. The circuit to thesignal lights 102 has been broken and they are cut off. Since thesolenoid 60 is deactuated, the latch mechanism 57 are in engagement withthe teeth 58 on the stop rod 54 for holding the lever 51 and the tensionroll 15 in the first position of the tension roll. If desired, asuitable holding circuit for the solenoid 60 may be employed for holdingthe latch 57 out of engagement with the teeth 58 until restarting of thespindle assembly 10.

The spindle assembly is now operating in normal condition again and isready for another stopping cycle, as described above. The generallymechanical components of the above described first embodiment of spindleassembly stopping mechanism, may be seen in FIG. 5. In FIGS. 6-8 of thedrawings, a second preferred embodiment of the automatic spindleassembly stopping means 32 is illustrated. In this second embodiment,like reference numerals are utilized for components which are the sameas that of the first embodiment illustrated in FIGS. 2-5 and describedabove.

In this second preferred embodiment, the yarn feeler switches 35 and36are electrically connected'from bus bar 42 with an electrical circuitincluding line 39 which leads to switch 152 which connects with a line153 to a motor 111 which has a line 51 leading therefrom to bus bar 43.The motor 111 includes a drive shaft 112 upon which is mounted a firstcircular rotating cam 115 having an outer camming surface 115a and aninner camming surface l15b on its circumference or periphery. A camfollower 117 successively engages the camming surfaces a and 115b of thecam 115 and is attached to one end of a brake lever 118 which ispivotally mounted between brake shoes 119 and on the inside of the whorl12 of the rotor mechanism 111 of the spindle assembly 10. When thefollower 117 rides onto the inner cam surface 115b, the brake lever 118will move under the influence of spring 122 for wedging apart the brakeshoes 119 and 120 for braking the rotor mechanism 11 of the spindleassembly 10. When the follower 117 is in engagement with the outer camsurface 115a, the brake mechanism 119, 120 for the spindle assembly 10is disengaged.

In this second preferred embodiment, the tension roll 15 is alsocontrolled by a lever 51 which is fulcrummed at 17 and carries thetension roll 15 on one end thereof.

On the other end of tension roll control lever 51 is a follower whichengages a second circular rotating cam 127 mounted on motor saft 112 andwhich has an outer camming surface 127a, a central camming surface 127band an inner camming surface 127C. The lever 51 is biased for engagementby the follower 125 with the cam 127 by a spring 63.

When the cam follower 125 is in engagement with the outer cam surface127a of the cam 127, the lever 51 and tension roll 15 are disposed inthe first position of the tension roll 15 holding the belt 14 in tightengagement with the whorl portion 12 of the spindle assembly 10 fornormal driving. When the rotating cam 127 movesto a position that thefollower 125 rides down onto the central camming surface 127b and theinner camming surface 1270, the lever 51 and tension roll 15 move to thesecond position of the tension roll 15 so as to hold the drive belt l4vin loose engagement with the whorl portion 12 of the spindle assembly 10for allowing braking of the spindle assembly 10 and slight rotation ofthe rotor mechanisms 11 of the spindle assembly 10 after braking.

The first cam 115 and the camming surfaces 115a and 115b are mounted inthe shaft 112 of the motor 110 relative to the mounting of the secondcam 127 and the camming surfaces 127a, 127b and 1276 such that the camfollower 125 comes into engagement with the central camming surface 127bof the cam 127 for movement of the tension roll 15 from its firstposition to its second position, while simultaneously, the cam follower117 on the brake actuating lever 118 moves into engagement with theinner camming surface llSb on the cam 1 15 for actuating the brake 1 19,120 to stop rotation of the rotor mechanism 11 of the spindle assemblyI0. Thereafter, the cam follower 117 moves onto the outer cammingsurface 115a of the first cam 1 15 to deactuate the brake 119 and 120,while the follower 125 on the tension roll control lever 51 moves intoengagement with the inner camming section 127c of the cam 127 to allowfor slight rotation of the rotor mechanism 11 of the spindle assembly 10by the tension roll 15 holding the belt 14 in loose engagement with thewhorl portion 12 of the spindle assembly 10.

For stopping of the spindle assembly 10 in the predetermined position, alever 130 is mounted for movement with the lever 51 and includes on theforward end thereof a similar spring biased projection 85 which extendsoutwardly therefrom and is pivotally mounted thereon for movementbetween stop pins 86 and 87.

As the follower 125 moves into engagement with the inner cam surface127C of the cam 127 after disengagement of the brake mechanism 119, 120and during slight rotation of the spindle assembly by the looseengagement of the drive belt 14, the projection 85 comes into closeproximity with the whorl portion 12 of the rotor mechanism 11 of thespindle assembly 10. A cooperating stop projection 88 is secured to thewhorl portion 12 of the spindle assembly 10 and as the whorl portion 12is slightly rotated under the influence of the loose contact of thedrive belt 14, the projection 88 comes into contact with the projection85 and the rotor mechanism 11 of the spingle assembly 10 is stopped in apredetermined position in which the channel 20 from which the yarn Yemerges from the rotor mechanism 1 1 faces the outside of the machinefor servicing by an operator.

The motor shaft 1 12 is also provided with a third circular rotating cam140 having inner and outer cam surfaces on the periphery thereof andwhich contact an electrical switch 95 which is disposed in a circuitcomprising lines 96 leading from line 41, line 97 which leads to themagnetic or other coupling of drive roll 29 and line 98 which leads fromthe coupling of drive roll 29 to bus bar 42. The cam 140 is positionedon the motor shaft 112 for actuating the switch 95 and deactuating thecoupling to the drive roll 29 when the spindle assembly is stopped.

A fourth circular rotating cam 150 is disposed on the motor shaft 112and includes inner and outer camming surfaces in engagement with theelectrical switch 152, described above. The switch 152 is arranged fordeactuation by the cam 150 to stop operation of the motor 11 1 uponengagement of the stop projections 85 and 88 and thereby stop rotationof the cams 115, 127, 140 and 150.

For purposes of actuating signal lights 102 in this embodiment, a fifthrotating cam 160 is provided with inner and outer cam surfaces whichengage an electrical switch 45. The electrical switch 45 when actuatedby the cam 160 completes a circuit through lines 162 to the line 101which is connected with bus bar 43 and through line 162 which connectswith bus bar 42 for lighting of the signal lights 102.

For purposes of restarting the spindle assembly 10 after it has beenstopped in a predetermined position and has been serviced by anoperator, a push shaft switch 54 is provided which is disposed in anelectrical line 171 to the motor 111 and which connects with the line153 to bypass the switch 152 so that when the push rod 54 is pushedagainst the bias of a spring 170, electrical current will be supplied tothe motor 11 for rotating the shaft 112 and the other cams, describedabove.

Since immediately after restarting of the drive roll 29 and the packageroll 27, the yarn Y still does not have sufficient tension to hold theyarn feeler switch 35 in its open position, the outer cam section 127a,in the same way as the outer cam section 1150, is made sufficiently longthat a sufficient thread tension holding the yarn feeler switch 35 opencan be built up. By the switch 152, which is acted upon by the cam 150,the feeding of current to the motor 111 is again interrupted while theswitch 45 is actuated by the cam 160 to extinguish the signal light 102.The stopping mechanism is then in position for another stopping cycle,as descirbed above.

Referring now to FIG. 8, there is shown a time distance study whichshows more clearly the course of the individual operations describedabove and the various cam surfaces. On the ordinate there has beenplotted the time in seconds, it being assumed that the cams rotate onceby 360 in 9.4 seconds after the occurrence of a break in the yarn or theformation of a full package of processed yarn. The time interval between6 and 6' seconds has been left blank and indicates the time at which thecam motor is stopped before actuation upon restarting of the motor.

The first or top function plotted is that of actuation of the yarnfeeler switches, either the switch 35 which detects a break in the yarnor the switch 36 which detects the formation of a full package of yarn.It is noted that the yarn feeler switches are disconnected shortly afterthe eighth second, when a sufficient thread tension is reached upon therestarting of the spindle assembly and the starting of the drive roll.

The next function plotted is that of the spindle brake cam andillustrates the outer cam surface 1150 at which time the brake isdisengaged and the inner cam surface ll5b at which time the brake isengaged. The sloped portion of the cam from the inner cam surface 115bto the outer cam surface 115a is the time during which disengagement ofthebrake is effected.

The belt tension roll cam 127 is next plotted and shows the outer camsurface 127a, the central cam surface 127b and the inner cam surface1270. The outer cam surface 127a is the portion in which the tensionroll holds the drive belt in tight frictional engagement with the whorlportion of the spindle assembly for normal rotation of the spindleassembly. The central cam section 127b and inner cam section are theportions in which the tension roll is moved to its second position forholding the drive belt in light frictional engagement with the whorlportion of the spindle assembly for allowing braking of the spindleassembly and for slight rotation of the spindle assembly followingdisengagement of the brake for stopping of the spindle assembly in thepredetermined position. The inner cam surface 1270 indicates the timeduring which the spindle assembly is stopped in its predeterminedposition.

The motor cam is next plotted and the inner cam surface indicates thetime during which the switch for supplying current to the motor isdisengaged.

Next is plotted the signal light cam and the outer cam surface indicatesthe time during which the signal light is lighted. Next is plotted thedrive roll cam 140 and the outer cam surfaces indicate the times duringwhich current is supplied to the coupling of the drive roll fordisengaging the coupling to the drive roll and then for engaging thecoupling of the drive roll. Next is plotted the time during which thedrive roll is rotatmg.

Next is plotted the time during which the spindle assembly is rotatingand the short portion between the fourth and fifth seconds indicates thetime during which slight rotation of the spindle assembly is effectedafter braking and immediately prior to stopping in a predeterminedposition. The next plotted function is the signal light and shows thetime during which the signal light is actuated. The last functionplotted is the restarting switch for restarting of the motor cam.

As may be seen, this invention has provided automatic means responsiveto a predtermined condition of yarn breakage and the formation of a fullpackage of processed yarn for stopping rotation of a spindle assembly ofa textile yarn processing machine, such as a twister, spinning frame orthe like, in a predetermined position. 'l'wo specific embodiments ofsuch automatic stopping means have been illustrated and described;however, it is to be understood that specific features of eitherembodiment or other specific features may be incorporated for providingan automatic stopping means in accordance with this invention.

In the drawings and specification there has been set forth preferredembodiments of this invention and, although specific terms have beenemployed, they are used in a generic and descriptive sense only and notfor purposes of limitation.

What is claimed is:

1. In a textile yarn processing machine, such as a twister, spinningframe or the like, having a plurality of rotatable spindle assembliesfor processing of yarn and forming a package of processed yarn and eachincluding a whorl portion for effecting rotation thereof and a brakemeans for stopping rotation thereof, a tangential drive belt meansengaging said whorl portions of said spindle assemblies for causingrotation thereof, and pivotally mounted tension roll means associatedwith each of said spindle assemblies for holding saiddrive belt intightdriving engagement with said whorl portion for normal rotation ofsaid spindle assembly in a first position thereof and movable to asecond position for holding said drive belt in loose engagement withsaid whorl portion of said spindle assembly for allowing stopping ofsaid spindle assembly and for slight rotation of said spindle assembly;the improvement of automatic means responsive to a predeterminedcondition of yarn breakage and/or the formation of a full package ofprocessed yarn for stopping rotation of said spindle assembly in apredetermined position, said means comprisyarn feeler means actuated bythe predetermined yarn condition; means operatively connected betweensaid yarn feeler means and said spindle assembly brake means foractuating said brake means to stop rotation of said spindle assemblyupon actuation of said yarn feeler means; tension roll control meansoperatively connected with said yarn feeler means for causing movementof said tension roll means to said second position upon actuation ofsaid yarn feeler means for allowing stopping of said spindle assembly; 1

time delayed means operatively connected with said yarn feeler means andsaid brake actuating means and responsive to actuation of said yarnfeeler means for deactuating said brake means after a predetermined timedelay for allowing the slight rotation of the spindle assembly by theloose engagement of the drive belt; and

spindle assembly stop means operatively associated with said spindleassembly and said time delayed means for stopping rotation of saidspindle assembly in the predetermined position after the predeterminedtime delay of said time delayed means and during the slight rotation ofsaid spindle assembly following deactuation of said spindle assemblybrake means.

2. In a textile yarn processing machine, as set forth in claim 1, inwhich said time delayed means includes means for maintaining saidspindle assembly brake means deactuated for a predetermined time aftersaid tension roll means has been moved back to said first position forrestarting normal rotation of said spindle assembly to insure thatsufficient tension has been built up in the yarn being processed by saidspindle assembly to avoid actuation of said yarn feeler means duringstart up.

3. In a textile yarn processing machine, as set forth in claim 1, inwhich said yarn feeler means includes an electrical switch means, andsaid spindle assembly brake actuating means comprises an electricalcircuit connected between said yarn feeler switch means and said spindleassembly brake means.

4. In a textile yarn processing machine, as set forth in claim 3, inwhich said tension roll control means comprises a lever means mountedfor pivotal movement medially thereof and carrying said tension rollmeans on one end thereof for movement between said first and secondpositions, menas biasing said lever means and said tension roll means inthe second position of said tension roll means, movable stop meansoperatively associated with the other end of said lever means forholding said lever means and said tension roll means in said firstposition of said tension roll means and for movement away from the otherend of said lever means for allowing movement of said lever means andsaid tension roll means to the second position of said tension rollmeans under the influence of said biasing means, and solenoid operatedlatch means operatively associated with said stop means and saidelectrical circuit means for holding said stop means against the otherend of said lever means to hold said lever means and said tension rollmeans in the first position of said tension roll means and responsive toactuation of said electrical circuit means by said feeler means to moveout of latching engagement with said stop means for allowing said levermeans and said tension roll means to move under the influence of saidbiasing means to the second position of said tension roll means.

5. In a textile yarn processing machine, as set forth in claim 4, inwhich said time delayed means is operatively connected with said levermeans for causing a time delay of the movement of said lever means andsaid tension roll means under the influence of said biasing meansbetween said first and second positions of said tension roll means.

6. In a textile yarn processing machine, as set forth in claim 5, inwhich said time delayed means comprises a fluid controlled, compressibleand expandable bellows means operatively connected with said lever meansfor compressing during movement of said lever means and said tensionroll means from said first position to said second position of saidtension roll means for delaying the time of movement a predeterminedamount.

7. In a textile yarn processing machine, as set forth in claim 6, inwhich said spindle assembly stop means comprises a projection secured toand extending from said lever means for movement with said lever meansinto close proximity with said whorl portion of said spindle assemblywhen said tension roll means moves to said second position, and aprojection secured to and extending from said whorl portion of saidspindle assembly for contact with said projection on said lever meanswhen said lever means and said tension roll means have moved to saidsecond position of said tension roll means after the time delay effectedby said time delayed means to stop rotation of said spindle assembly inthe predetermined position.

8. In a textile yarn processing machine, as set forth in claim 7, inwhich each of said spindle assemblies includes a surface driven packageroll for receiving the processed yarn from the spindle assembly andforming a package thereof and a drive roll contacting the surface ofsaid package roll for rotatably driving said package roll, and in whichsaid automatic means responsive to the predetermined yarn conditionfurthter includes means operatively associated with said time delayedmeans and said drive roll for stopping operation of said drive roll uponactuation of said yarn feeler means and after the predetermined timedelay.

9. In a textile yarn processing machine, as set forth in claim 8, inwhich said movable stop means for said tension roll control lever meanscomprises an elongate shaft mounted for manual movement against theother end of said lever means for returning said lever means and saidtension roll means against the influence of said biasing means to saidfirst position of said tension roll means for again starting up rotationof the spindle assembly after stoppage due to the predetermined yarncondition, and in which said time delayed means further includes alagging lever means pivotally mounted with said tension roll controllever means for movement therewith when said tension roll means movesfrom said first position to said second position and which lags behindsaid tension roll control lever means when said tension roll means andsaid tension roll control lever means are moved from said secondposition to said first position of said tension roll means by the manualmovement of said shaft means so that deactuation of said brake meansremains in effect for a predetermined time delay after movement of saidtension roll means from said second position to said first position forstart up of said spindle assembly to insure that sufficient tension hasbeen built up in the yarn being processed by the spindle assembly toavoid actuation of said yarn feeler means during start up.

10. In a textile yarn processing machine, as set forth in claim 1, inwhich said yarn feeler means includes an electrical switch means, and inwhich said spindle assembly brake actuating means comprises anelectrical circuit connected with said yarn feeler switch means foractuation thereby, a motor connected with said electrical circuit emansfor actuation thereby, a first circular rotating cam means driven bysaid motor means and having an outer camming surface and an innercamming surface on its circumference, cam follower means forsuccessively engaging said camming surfaces and brake actuating levermeans connected to said cam follower for actuating said brake means whensaid cam follower means is in engagement with said inner camming surfaceand for deactuating said brake means when said cam follower means is inengagement with said outer camming surface.

11. In a textile yarn processing machine, as set forth in claim 10, inwhich said tension roll control means comprises a second circular,rotating cam meansdriven by said motor means and having an outer cammingsurface, a central camming surface and an inner camming surface on itscircumference, a lever means mounted for pivotal movement mediallythereof and carrying said tension roll means on one end thereof formovement between said first and second positions, means biasing saidlever means and said tension roll means in the second position of saidtension roll means, follower means disposed on the other end of saidlever means for successively engaging the camming surfaces on saidsecond cam means and for holding said lever means and said tension rollmeans in said first position of said tension roll means duringengagement with said outer camming surface and for allowing movement ofsaid lever means and said tension roll means to the second position ofsaid tension roll means under the influence of said biasing means duringengagement with said central and said inner camming surfaces.

12. In a textile yarn processing machine, as set forth in claim 11, inwhich said time delayed means comprises said first cam means and saidinner and outer camming surfaces being mounted for rotation relative tosaid second cam means and said camming surfaces thereon so that saidouter camming surface of said first cam means comes into engagement withsaid cam follower on said brake actuation lever for deactuating saidspindle brake means while said cam follower on said tension roll controllever is in engagement with said central and said inner camming surfaceson said second cam means for holding said tension r'oll means in saidsecond position for allowing slight rotation of the spindle assembly bythe loose engagement of the drive belt.

13. In a textile yarn processing machine, as set forth in claim 12, inwhich said spindle assembly stop means comprises a spindle assembly stoplever connected with said tension roll control lever for movementtherewith and having aprojection secured to and extending from saidspindle stop lever, a projection secured to and extending from saidwhorl portion of said spindle assembly for contact with said projectionon said stop lever for stopping said spindle assembly in thepredetermined position when said cam follower on said tension rollcontrol lever moves into engagement with said inner camming surface onsaid second cam means.

14. In a textile yarn processing machine, as set forth in claim 13, inwhich each of said spindle assembies includes a surface driven packageroll for receiving the processed yarn from the spindle assembly andforming a package thereof and a drive roll contacting the surface ofsaid package roll for rotatably driving said package roll, and in whichsaid automatic means responsive to the predetermined yarn conditionfurther includes a third circular rotating cam means driven by saidmotor means and having outer and inner camming surfaces on the peripherythereof, and a switch means positioned for engagement by the cammingsurfaces of said third cam means and actuated when one of the cammingsurfaces comes into engagement with said switch means, said switch meansbeing operatively connected with said drive roll for stopping operationof said drive roll upon actuation of said switch means.

15. In a textile yarn processing machine, as set forth in claim 14, inwhich said automatic means responsive to the predetermined yarncondition further includes a fourth circular rotating cam means drivenby said motor means and having outer and inner camming surfaces on itscircumference, and an electrical switch means in contact with fourth cammeans for actuation thereby when one of said inner and outer cammingsurfaces comes into engagement with said switch means, said switch meansbeing connected to said motor means for stopping operation of said motormeans and rotation of all of said cam means when said spindle assemblyhas been stopped in the predetermined position.

16. In a textile yarn twister having a plurality of rotatable spindleassemblies for twisting of yarn and each including a whorl portion foreffecting rotation thereof and a brake means for stopping rotationthereof, a tangential drive belt means engaging and driving said whorlportions and pivotally mounted tension roll means for holding said drivebelt in tight driving engagement with said whorl portions for normalrotation of said spindle assembly in a first position thereof andmovable to a second position for holding said drive belt in looseengagement with said whorl portion for allow ing stopping of saidspindle assembly and for slight rotation of said spindle assembly, and asurface driven package roll associated with each of said spindleassemblies for receiving processed yarn from the spindle assembly andforming a package thereof and a drive roll contacting the surface ofsaid package roll for rotatably driving said package roll; theimprovement of automatic means responsive to a predetermined conditionof yarn breakage and the formation of a full package of processed'yarnfor stopping rotation of said spindle assembly in a predeterminedposition, said means comprising: Y

yarn feeler means comprising a first electrical switch engaging the yarnas it passes from said spindle assembly to said package roll foractuation when yarn breakage occurs, and a second electrical switchcontacting the surface of the package of yarn on said package roll foractuation upon the formation of a full package of processed yarn;

electrical circuit means operatively connected between said yarn feelerswitches and said spindle assembly brake means for actuating said brakemeans to stop rotation of said spindle assembly upon actuation of eitherof said yarn feeler switches; tension roll control means comprising alever mounted for pivotal movement medially thereof and carrying saidtension roll means on one end thereof for movement between said firstand second positions, means biasing said lever means and said tensionroll means in the second position of said tension roll means, movablestop means operatively associated with the other end of said lever meansand solenoid operated latch means operatively associated with said stopmeans and said electrical circuit emans for holding said stop meansagainst the other end of said lever means'to hold said lever means andsaid tension roll means in the first position of said tension roll meansand responsive to actuation of said electrical circuit means by eitherof said yarn feeler switch means to move out of latching engagement withsaid stop means for allowing said lever means, said tension roll meansand said stop means to-move under the influence of said biasing means tothe second position of said tension roll means;

time delayed means comprising a fluid controlled,

compressible andexpandable bellows means operatively connected with saidtension'roll lever means for compressing during movement of said levermeans and said tension roll means from saidfirst position to said-secondposition for delaying the,

means for deactuation to deactuate said electrical circuit means afterthe time delayed movement of said tension roll means to said secondposition for deactuating said brake means at a predetermined time delayfor allowing the slight rotation of the spindle assembly by the looseengagement of said drive belt;

spindle assembly stop means comprising a projection secured to andextending from said tension roll control lever means for movement withsaid lever means into close proximity with said whorl portion of saidspindle assembly when said tension roll means moves to said secondposition, and a projection secured to and extending from said whorlportion of said spindle assembly for contact with said projection onsaid lever means when said lever means and said tension roll means havemoved to said second position of the tension roll means after the timedelay effected by said time delayed means to stop rotation of saidspindle assembly in the predetermined position; and

means operatively associated with said time delayed means and said driveroll for stopping operation of said drive roll upon actuation of eitherof said yarn feeler switch means and after the predetermined time delay.

17. In a textile yarn processing machine, as set forth in claim 16, inwhich said movable stop means for said tension roll control lever meanscomprises an elongate shaft mounted for manual movement against theother end of said lever means for returning said lever means and saidtension roll means against the influence of said biasing means to saidfirst position of said tension roll means for again starting up rotationof the spindle assembly after stoppage due to the predetermined yarncondition, and in which said time delayed means further includes alagging lever means pivotally mounted with said tension roll controllever means for movement therewith when said tension roll means movesfrom said first position to said second position and which lags behindsaid tension roll control lever means when said tension roll means andsaid tension roll control lever means are moved from said secondposition to said first position of said tension roll means by the manualmovement of said shaft means so that deactua- 7 tion of said brake meansremains in effect for a predetermined time delay after movement of saidtension roll means from said second position to said first position forstart up of said spindle assembly to insure that sufficient tension hasbeen built up in the yarn being proof said spindle assembly in a firstposition thereof and movable to a second position for holding said drivebelt in loose engagement with said whorl portion for allowing stoppingof said spindle assembly and for slight rotation of said spindleassembly, and a surface driven package roll associated with each spindleassembly for receiving the processed yarn therefrom and forming apackage thereof and a drive roll contacting the surface of said packageroll for rotatably driving said package roll; the improvement ofautomatic means responsive to a predetermined condition of yarn breakageand the formation of a full package of processed yarn for stoppingrotation of said spindle assembly in a predetermined position, saidmeans comprising:

yarn feeler means comprising a first electrical switch engaging the yarnas it passes from said spindle assembly to said package roll foractuation when breakage occurs, and a second electrical switchcontacting the surface of the package of yarn on said package roll foractuation upon the formation of a full package of processed yarn; meansoperatively connected between said yarn feeler switches and said spindleassembly brake means for actuating said brake means to stop rotation ofsaid spindle assembly upon actuation of either of said yarn feelerswitches, said spindle assembly brake actuating means comprising anelectrical circuit connected with said yarn feeler switches foractuation when either of said switches is actuated, a motor connectedwith said electrical circuit for actuation when said electrical circuitis actuated, a first circular rotating cam driven by said motor andhaving an outer and an inner camming surface on its circumference, a camfollower for successively engaging said camming surfaces and a brakeactuating lever means connected to said cam follower for actuating saidbrake means when said cam follower is in engagement with said innercamming surface and for deactuating said brake means when said camfollower is in engagement with said outer camming surface; tension rollcontrol means comprising a second circular rotating cam driven by saidmotor and having an outer, a central and an inner camming surface on itscircumference, a lever means mounted for pivotal movement mediallythereof and carrying said tension roll means on one end thereof formovement between said first and second positions,

means biasing said lever means and said tension roll means in the secondposition of said tension roll means, a cam follower disposed on theother end of said lever means for successively engaging the cammingsurfaces on said second cam and for holding said lever means and saidtension roll means in said first position of said tension roll meansduring engagement with said outer camming surface and for allowingmovement of said lever means and said tension roll means to the secondposition of said tension roll means under the influence of said biasingmeans during engagement with said central and said inner cammingsurfaces for allowing stopping of said spindle assembly; time delayedmeans operatively connected with said yarn feeler switch means and saidbrake actuating means and responsive to actuation of either of said yarnfeeler switches for deactuating said brake means after a predeterminedtime delay for allowing the slight rotation of the spindle assembly bythe loose engagement of the drive belt, said time delayed meanscomprising said first cam and said inner and outer camming surfacesbeing mounted for rotation relative to said second cam and said cammingsurfaces thereon so that said outer camming surface of said first camcomes into engagement with said cam follower on said brake actuatinglever for deactuating said spindle assembly brake means while said camfollower on said tension roll control lever is in engagement with saidcentral and said inner camming surfaces on said second cam for holdingsaid tension roll means in said second position for allowing slightrotation of the spindle assembly by the loose engagement of the drivebelt;

spindle assembly stop means comprising a spindle assembly stop leverconnected with said tension roll control lever for movement therewithand having a projection secured to and extending from said spindle stoplever, a projection secured to and extending from said whorl portion ofsaid spindle assembly for contact with said projection on said stoplever for stopping said spindle assembly in the predetermined positionwhen said cam follower on said tension roll control lever moves intoengagement with said inner camming surface on said second cam means andafter the predetermined time delay of said time delayed means and duringthe slight rotation of said spindle assembly following deactuation ofsaid spindle brake means;

a third circular rotating cam driven by said motor means and havingouter and inner camming surfaces on the periphery thereof, and anelectrical switch means positioned for engagement by the cammingsurfaces of said third cam and actuated when one of the camming surfacescomes into engagement with said switch means, said switch means beingoperatively connected with said drive roll for stopping operation ofsaid drive roll upon actuation of said switch means; and

a fourth circular rotating cam driven by said motor means and havingouter and inner camming surfaces on its circumference, an electricalswitch means in contact with said fourth cam for actuation thereby whenone of said inner and outer camming surfaces comes into engagement withsaid switch means, said switch means being connected to said motor meansfor stopping operation of said motor means and rotation of all of saidcams when said spindle assembly has been stopped in the predeterminedposition.

1. In a textile yarn processing machine, such as a twister, spinningframe or the like, having a plurality of rotatable spindle assembliesfor processing of yarn and forming a package of processed yarn and eachincluding a whorl portion for effecting rotation thereof and a brakemeans for stopping rotation thereof, a tangential drive belt meansengaging said whorl portions of said spindle assemblies for causingrotation thereof, and pivotally mounted tension roll means associatedwith each of said spindle assemblies for holding said drive belt intight driving engagement with said whorl portion for normal rotation ofsaid spindle assembly in a first position thereof and movable to asecond position for holding said drive belt in loose engagement withsaid whorl portion of said spindle assembly for allowing stopping ofsaid spindle assembly and for slight rotation of said spindle assembly;the improvement of automatic means responsive to a predeterminedcondition of yarn breakage and/or the formation of a full package ofprocessed yarn for stopping rotation of said spindle assembly in apredetermined position, said means comprising: yarn feeler meansactuated by the predetermined yarn condition; means operativelyconnected between said yarn feeler means and said spindle assembly brakemeans for actuating said brake means to stop rotation of said spindleassembly upon actuation of said yarn feeler means; tension roll controlmeans operatively connected with said yarn feeler means for causingmovement of said tension roll means to said second position uponactuation of said yarn feeler means for allowing stopping of saidspindle assembly; time delayed means operatively connected with saidyarn feeler means and said brake actuating means and responsive toactuation of said yarn feeler means for deactuating said brake meansafter a predetermined time delay for allowing the slight rotation of thespindle assembly by the loose engagement of the drive belt; and spindleassembly stop means operatively associated with said spindle assemblyand said time delayed means for stopping rotation of said spindleassembly in the predetermined position after the predetermined timedelay of said time delayed means and during the slight rotation of saidspindle assembly following deactuation of said spindle assembly brakemeans.
 2. In a textile yarn processing machine, as set forth in claim 1,in which said time delayed means includes means for maintaining saidspindle assembly brake means deactuated for a predetermined time aftersaid tension roll means has been moved back to said first position forrestarting normal rotation of said spindle assembly to insure thatsufficient tension has been built up in the yarn being processed by saidspindle assembly to avoid actuation of said yarn feeler means duringstart up.
 3. In a textile yarn processing machine, as set forth in claim1, in which said yarn feeler means includes an electrical switch means,and said spindle assembly brake actuating means comprises an electricalcircuit connected between said yarn feeler switch means and said spindleassembly brake means.
 4. In a textile yarn processing machine, as setforth in claim 3, in which said tenSion roll control means comprises alever means mounted for pivotal movement medially thereof and carryingsaid tension roll means on one end thereof for movement between saidfirst and second positions, menas biasing said lever means and saidtension roll means in the second position of said tension roll means,movable stop means operatively associated with the other end of saidlever means for holding said lever means and said tension roll means insaid first position of said tension roll means and for movement awayfrom the other end of said lever means for allowing movement of saidlever means and said tension roll means to the second position of saidtension roll means under the influence of said biasing means, andsolenoid operated latch means operatively associated with said stopmeans and said electrical circuit means for holding said stop meansagainst the other end of said lever means to hold said lever means andsaid tension roll means in the first position of said tension roll meansand responsive to actuation of said electrical circuit means by saidfeeler means to move out of latching engagement with said stop means forallowing said lever means and said tension roll means to move under theinfluence of said biasing means to the second position of said tensionroll means.
 5. In a textile yarn processing machine, as set forth inclaim 4, in which said time delayed means is operatively connected withsaid lever means for causing a time delay of the movement of said levermeans and said tension roll means under the influence of said biasingmeans between said first and second positions of said tension rollmeans.
 6. In a textile yarn processing machine, as set forth in claim 5,in which said time delayed means comprises a fluid controlled,compressible and expandable bellows means operatively connected withsaid lever means for compressing during movement of said lever means andsaid tension roll means from said first position to said second positionof said tension roll means for delaying the time of movement apredetermined amount.
 7. In a textile yarn processing machine, as setforth in claim 6, in which said spindle assembly stop means comprises aprojection secured to and extending from said lever means for movementwith said lever means into close proximity with said whorl portion ofsaid spindle assembly when said tension roll means moves to said secondposition, and a projection secured to and extending from said whorlportion of said spindle assembly for contact with said projection onsaid lever means when said lever means and said tension roll means havemoved to said second position of said tension roll means after the timedelay effected by said time delayed means to stop rotation of saidspindle assembly in the predetermined position.
 8. In a textile yarnprocessing machine, as set forth in claim 7, in which each of saidspindle assemblies includes a surface driven package roll for receivingthe processed yarn from the spindle assembly and forming a packagethereof and a drive roll contacting the surface of said package roll forrotatably driving said package roll, and in which said automatic meansresponsive to the predetermined yarn condition furthter includes meansoperatively associated with said time delayed means and said drive rollfor stopping operation of said drive roll upon actuation of said yarnfeeler means and after the predetermined time delay.
 9. In a textileyarn processing machine, as set forth in claim 8, in which said movablestop means for said tension roll control lever means comprises anelongate shaft mounted for manual movement against the other end of saidlever means for returning said lever means and said tension roll meansagainst the influence of said biasing means to said first position ofsaid tension roll means for again starting up rotation of the spindleassembly after stoppage due to the predetermined yarn condition, and inwhich said time delayed means further includes a lagging lever meanspivotallY mounted with said tension roll control lever means formovement therewith when said tension roll means moves from said firstposition to said second position and which lags behind said tension rollcontrol lever means when said tension roll means and said tension rollcontrol lever means are moved from said second position to said firstposition of said tension roll means by the manual movement of said shaftmeans so that deactuation of said brake means remains in effect for apredetermined time delay after movement of said tension roll means fromsaid second position to said first position for start up of said spindleassembly to insure that sufficient tension has been built up in the yarnbeing processed by the spindle assembly to avoid actuation of said yarnfeeler means during start up.
 10. In a textile yarn processing machine,as set forth in claim 1, in which said yarn feeler means includes anelectrical switch means, and in which said spindle assembly brakeactuating means comprises an electrical circuit connected with said yarnfeeler switch means for actuation thereby, a motor connected with saidelectrical circuit emans for actuation thereby, a first circularrotating cam means driven by said motor means and having an outercamming surface and an inner camming surface on its circumference, camfollower means for successively engaging said camming surfaces and brakeactuating lever means connected to said cam follower for actuating saidbrake means when said cam follower means is in engagement with saidinner camming surface and for deactuating said brake means when said camfollower means is in engagement with said outer camming surface.
 11. Ina textile yarn processing machine, as set forth in claim 10, in whichsaid tension roll control means comprises a second circular, rotatingcam means driven by said motor means and having an outer cammingsurface, a central camming surface and an inner camming surface on itscircumference, a lever means mounted for pivotal movement mediallythereof and carrying said tension roll means on one end thereof formovement between said first and second positions, means biasing saidlever means and said tension roll means in the second position of saidtension roll means, follower means disposed on the other end of saidlever means for successively engaging the camming surfaces on saidsecond cam means and for holding said lever means and said tension rollmeans in said first position of said tension roll means duringengagement with said outer camming surface and for allowing movement ofsaid lever means and said tension roll means to the second position ofsaid tension roll means under the influence of said biasing means duringengagement with said central and said inner camming surfaces.
 12. In atextile yarn processing machine, as set forth in claim 11, in which saidtime delayed means comprises said first cam means and said inner andouter camming surfaces being mounted for rotation relative to saidsecond cam means and said camming surfaces thereon so that said outercamming surface of said first cam means comes into engagement with saidcam follower on said brake actuation lever for deactuating said spindlebrake means while said cam follower on said tension roll control leveris in engagement with said central and said inner camming surfaces onsaid second cam means for holding said tension roll means in said secondposition for allowing slight rotation of the spindle assembly by theloose engagement of the drive belt.
 13. In a textile yarn processingmachine, as set forth in claim 12, in which said spindle assembly stopmeans comprises a spindle assembly stop lever connected with saidtension roll control lever for movement therewith and having aprojection secured to and extending from said spindle stop lever, aprojection secured to and extending from said whorl portion of saidspindle assembly for contact with said projection on said stop lever forstopping said spindle assembly in the predetermined Position when saidcam follower on said tension roll control lever moves into engagementwith said inner camming surface on said second cam means.
 14. In atextile yarn processing machine, as set forth in claim 13, in which eachof said spindle assembies includes a surface driven package roll forreceiving the processed yarn from the spindle assembly and forming apackage thereof and a drive roll contacting the surface of said packageroll for rotatably driving said package roll, and in which saidautomatic means responsive to the predetermined yarn condition furtherincludes a third circular rotating cam means driven by said motor meansand having outer and inner camming surfaces on the periphery thereof,and a switch means positioned for engagement by the camming surfaces ofsaid third cam means and actuated when one of the camming surfaces comesinto engagement with said switch means, said switch means beingoperatively connected with said drive roll for stopping operation ofsaid drive roll upon actuation of said switch means.
 15. In a textileyarn processing machine, as set forth in claim 14, in which saidautomatic means responsive to the predetermined yarn condition furtherincludes a fourth circular rotating cam means driven by said motor meansand having outer and inner camming surfaces on its circumference, and anelectrical switch means in contact with fourth cam means for actuationthereby when one of said inner and outer camming surfaces comes intoengagement with said switch means, said switch means being connected tosaid motor means for stopping operation of said motor means and rotationof all of said cam means when said spindle assembly has been stopped inthe predetermined position.
 16. In a textile yarn twister having aplurality of rotatable spindle assemblies for twisting of yarn and eachincluding a whorl portion for effecting rotation thereof and a brakemeans for stopping rotation thereof, a tangential drive belt meansengaging and driving said whorl portions and pivotally mounted tensionroll means for holding said drive belt in tight driving engagement withsaid whorl portions for normal rotation of said spindle assembly in afirst position thereof and movable to a second position for holding saiddrive belt in loose engagement with said whorl portion for allowingstopping of said spindle assembly and for slight rotation of saidspindle assembly, and a surface driven package roll associated with eachof said spindle assemblies for receiving processed yarn from the spindleassembly and forming a package thereof and a drive roll contacting thesurface of said package roll for rotatably driving said package roll;the improvement of automatic means responsive to a predeterminedcondition of yarn breakage and the formation of a full package ofprocessed yarn for stopping rotation of said spindle assembly in apredetermined position, said means comprising: yarn feeler meanscomprising a first electrical switch engaging the yarn as it passes fromsaid spindle assembly to said package roll for actuation when yarnbreakage occurs, and a second electrical switch contacting the surfaceof the package of yarn on said package roll for actuation upon theformation of a full package of processed yarn; electrical circuit meansoperatively connected between said yarn feeler switches and said spindleassembly brake means for actuating said brake means to stop rotation ofsaid spindle assembly upon actuation of either of said yarn feelerswitches; tension roll control means comprising a lever mounted forpivotal movement medially thereof and carrying said tension roll meanson one end thereof for movement between said first and second positions,means biasing said lever means and said tension roll means in the secondposition of said tension roll means, movable stop means operativelyassociated with the other end of said lever means and solenoid operatedlatch means operatively associated with said stop means and saidelectrical circuit emans for holding said stop means against the otherend of said lever means to hold said lever means and said tension rollmeans in the first position of said tension roll means and responsive toactuation of said electrical circuit means by either of said yarn feelerswitch means to move out of latching engagement with said stop means forallowing said lever means, said tension roll means and said stop meansto move under the influence of said biasing means to the second positionof said tension roll means; time delayed means comprising a fluidcontrolled, compressible and expandable bellows means operativelyconnected with said tension roll lever means for compressing duringmovement of said lever means and said tension roll means from said firstposition to said second position for delaying the time of movement apredetermined amount, and a switch means disposed in said electricalcircuit means and operatively connected to said bellows means fordeactuation to deactuate said electrical circuit means after the timedelayed movement of said tension roll means to said second position fordeactuating said brake means at a predetermined time delay for allowingthe slight rotation of the spindle assembly by the loose engagement ofsaid drive belt; spindle assembly stop means comprising a projectionsecured to and extending from said tension roll control lever means formovement with said lever means into close proximity with said whorlportion of said spindle assembly when said tension roll means moves tosaid second position, and a projection secured to and extending fromsaid whorl portion of said spindle assembly for contact with saidprojection on said lever means when said lever means and said tensionroll means have moved to said second position of the tension roll meansafter the time delay effected by said time delayed means to stoprotation of said spindle assembly in the predetermined position; andmeans operatively associated with said time delayed means and said driveroll for stopping operation of said drive roll upon actuation of eitherof said yarn feeler switch means and after the predetermined time delay.17. In a textile yarn processing machine, as set forth in claim 16, inwhich said movable stop means for said tension roll control lever meanscomprises an elongate shaft mounted for manual movement against theother end of said lever means for returning said lever means and saidtension roll means against the influence of said biasing means to saidfirst position of said tension roll means for again starting up rotationof the spindle assembly after stoppage due to the predetermined yarncondition, and in which said time delayed means further includes alagging lever means pivotally mounted with said tension roll controllever means for movement therewith when said tension roll means movesfrom said first position to said second position and which lags behindsaid tension roll control lever means when said tension roll means andsaid tension roll control lever means are moved from said secondposition to said first position of said tension roll means by the manualmovement of said shaft means so that deactuation of said brake meansremains in effect for a predetermined time delay after movement of saidtension roll means from said second position to said first position forstart up of said spindle assembly to insure that sufficient tension hasbeen built up in the yarn being processed by the spindle assembly toavoid actuation of said yarn feeler means during start up.
 18. In atextile yarn twister having a plurality of rotatable spindle assembliesfor twisting of yarn and each including a whorl portion for effectingrotation thereof and a brake means for stopping rotation thereof, atangential drive belt means engaging and driving said whorl portions,and pivotally mounted tension roll means for holding said drive belt intight driving engagement with said whorl portion for normal rotation ofsaid spindle assembly in a first posiTion thereof and movable to asecond position for holding said drive belt in loose engagement withsaid whorl portion for allowing stopping of said spindle assembly andfor slight rotation of said spindle assembly, and a surface drivenpackage roll associated with each spindle assembly for receiving theprocessed yarn therefrom and forming a package thereof and a drive rollcontacting the surface of said package roll for rotatably driving saidpackage roll; the improvement of automatic means responsive to apredetermined condition of yarn breakage and the formation of a fullpackage of processed yarn for stopping rotation of said spindle assemblyin a predetermined position, said means comprising: yarn feeler meanscomprising a first electrical switch engaging the yarn as it passes fromsaid spindle assembly to said package roll for actuation when breakageoccurs, and a second electrical switch contacting the surface of thepackage of yarn on said package roll for actuation upon the formation ofa full package of processed yarn; means operatively connected betweensaid yarn feeler switches and said spindle assembly brake means foractuating said brake means to stop rotation of said spindle assemblyupon actuation of either of said yarn feeler switches, said spindleassembly brake actuating means comprising an electrical circuitconnected with said yarn feeler switches for actuation when either ofsaid switches is actuated, a motor connected with said electricalcircuit for actuation when said electrical circuit is actuated, a firstcircular rotating cam driven by said motor and having an outer and aninner camming surface on its circumference, a cam follower forsuccessively engaging said camming surfaces and a brake actuating levermeans connected to said cam follower for actuating said brake means whensaid cam follower is in engagement with said inner camming surface andfor deactuating said brake means when said cam follower is in engagementwith said outer camming surface; tension roll control means comprising asecond circular rotating cam driven by said motor and having an outer, acentral and an inner camming surface on its circumference, a lever meansmounted for pivotal movement medially thereof and carrying said tensionroll means on one end thereof for movement between said first and secondpositions, means biasing said lever means and said tension roll means inthe second position of said tension roll means, a cam follower disposedon the other end of said lever means for successively engaging thecamming surfaces on said second cam and for holding said lever means andsaid tension roll means in said first position of said tension rollmeans during engagement with said outer camming surface and for allowingmovement of said lever means and said tension roll means to the secondposition of said tension roll means under the influence of said biasingmeans during engagement with said central and said inner cammingsurfaces for allowing stopping of said spindle assembly; time delayedmeans operatively connected with said yarn feeler switch means and saidbrake actuating means and responsive to actuation of either of said yarnfeeler switches for deactuating said brake means after a predeterminedtime delay for allowing the slight rotation of the spindle assembly bythe loose engagement of the drive belt, said time delayed meanscomprising said first cam and said inner and outer camming surfacesbeing mounted for rotation relative to said second cam and said cammingsurfaces thereon so that said outer camming surface of said first camcomes into engagement with said cam follower on said brake actuatinglever for deactuating said spindle assembly brake means while said camfollower on said tension roll control lever is in engagement with saidcentral and said inner camming surfaces on said second cam for holdingsaid tension roll means in said second position for allowing slightrotation of the spindle assembly by the loose engagement of the drivebelt; Pg,50 spindle assembly stop means comprising a spindle assemblystop lever connected with said tension roll control lever for movementtherewith and having a projection secured to and extending from saidspindle stop lever, a projection secured to and extending from saidwhorl portion of said spindle assembly for contact with said projectionon said stop lever for stopping said spindle assembly in thepredetermined position when said cam follower on said tension rollcontrol lever moves into engagement with said inner camming surface onsaid second cam means and after the predetermined time delay of saidtime delayed means and during the slight rotation of said spindleassembly following deactuation of said spindle brake means; a thirdcircular rotating cam driven by said motor means and having outer andinner camming surfaces on the periphery thereof, and an electricalswitch means positioned for engagement by the camming surfaces of saidthird cam and actuated when one of the camming surfaces comes intoengagement with said switch means, said switch means being operativelyconnected with said drive roll for stopping operation of said drive rollupon actuation of said switch means; and a fourth circular rotating camdriven by said motor means and having outer and inner camming surfaceson its circumference, an electrical switch means in contact with saidfourth cam for actuation thereby when one of said inner and outercamming surfaces comes into engagement with said switch means, saidswitch means being connected to said motor means for stopping operationof said motor means and rotation of all of said cams when said spindleassembly has been stopped in the predetermined position.